Yesterday I wanted to increase my home directory size as I constantly got notified about critical amount of space. Firstly, as suggested in many topics, I wanted to do external back up of my system, so according to this answer I did:
sudo tar czf /media/external-disk/backup.tar.gz --exclude=/backup.tar.gz --exclude=/dev --exclude=/mnt --exclude=/proc --exclude=/sys --exclude=/tmp --exclude=/lost+found --exclude=/media /
Unfortunetely, after an hour of creating a back up the process ended in some error (I don't remember the exact notice but it wasn't very informative). So I decided to gave it up for yesterday and try again today's morning. Unfortunetely, when I open my laptop today Ubuntu doesn't boot at all:
The second message is something that used to pop out earlier, but usually there wary many lines of this message - now it's a one line back and back again. The first message (recovering journal) is something new though. How can I check why my Ubuntu doesn't boot up now? What might have gone wrong while backing up? How can I fix it now?
@Edit: I also installed Nvidia 4.30 driver yesterday, although I had a newer one (4.40) already installed. After that I restarted computer and Ubuntu booted without any problems, but maybe this is a reason behind my issue?
